131910881 has 2 divisors, whose sum is σ = 131910882. Its totient is φ = 131910880.

The previous prime is 131910833. The next prime is 131910907. The reversal of 131910881 is 188019131.

131910881 is nontrivially palindromic in base 15.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112550881 + 19360000 = 10609^2 + 4400^2 .

It is a cyclic number.

It is not a de Polignac number, because 131910881 - 2²² = 127716577 is a prime.

It is a super-2 number, since 2×131910881² = 34800961052392322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131916881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65955440 + 65955441.

It is an arithmetic number, because the mean of its divisors is an integer number (65955441).

Almost surely, 2^131910881 is an apocalyptic number.

It is an amenable number.

131910881 is a deficient number, since it is larger than the sum of its proper divisors (1).

131910881 is an equidigital number, since it uses as much as digits as its factorization.

131910881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 32.

The square root of 131910881 is about 11485.2462315790. The cubic root of 131910881 is about 509.0497247634.

The spelling of 131910881 in words is "one hundred thirty-one million, nine hundred ten thousand, eight hundred eighty-one".